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The first item sold on eBay was a broken laser pointer for $14.83 in 1995. This sale marked the beginning of eBay as an online marketplace and the viability of online auctions.$

The first online banner ad appeared on the website HotWired in 1994 for AT&T, and it signified the start of online advertising and marketing.

The first tweet was made by co-founder Jack Dorsey on March 21, 2006, which read 'just setting up my twttr'. This marked the start of the microblogging service Twitter.

The first email was sent by Ray Tomlinson in 1971. He used the ARPANET system, which was a precursor to the internet. This event marked the beginning of electronic mail communication.

The first social media site is considered to be SixDegrees.com, launched in 1997. It allowed users to create profiles and become friends with other users.

The first example of online streaming was a live band called Severe Tire Damage on June 24, 1993. They streamed their performance live on the internet, paving the way for future streaming services.

The first image ever uploaded to the internet was an image of the comedy band 'Les Horribles Cernettes', in 1992 at CERN. This demonstrated the web's capacity to display pictures.

The first YouTube video, titled 'Me at the zoo,' was uploaded by co-founder Jawed Karim on April 23, 2005. This video marked the inception of the user-generated content platform that YouTube has become.

The first registered domain was symbolics.com on March 15, 1985, for Symbolics Inc., a computer manufacturer. This marked the beginning of the domain name registration system.